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Optics Letters

Optics Letters


  • Vol. 27, Iss. 5 — Mar. 1, 2002
  • pp: 342–344

Absorption spectrum of surface-bound cap-shaped gold particles

Hiroyuki Takei, Michael Himmelhaus, and Takayuki Okamoto  »View Author Affiliations

Optics Letters, Vol. 27, Issue 5, pp. 342-344 (2002)

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A surface-adsorbed monolayer of cap-shaped gold particles upon submicrometer-sized polystyrene spheres exhibits pronounced absorption in the visible region. When the surrounding refractive index was altered by immersion in a fluid, the direction of the shift in the absorption spectrum was dependent on the incidence angle of the irradiation. When a thiol molecule, known to adsorb selectively on gold upon polystyrene, was added, the resultant shift in the absorption spectrum's peak was consistently toward longer wavelengths. Consequently, at certain incidence angles, a change in the refractive index of the surrounding fluid produces no shift, whereas thiol adsorption results in a clear shift, apparently reflecting the different spatial regions in which the refractive index is altered by these two procedures.

© 2002 Optical Society of America

OCIS Codes
(160.3900) Materials : Metals
(240.6680) Optics at surfaces : Surface plasmons
(310.1860) Thin films : Deposition and fabrication
(310.6860) Thin films : Thin films, optical properties
(350.4990) Other areas of optics : Particles

Hiroyuki Takei, Michael Himmelhaus, and Takayuki Okamoto, "Absorption spectrum of surface-bound cap-shaped gold particles," Opt. Lett. 27, 342-344 (2002)

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